libc/stdio/tmpnam_r.c

   1 /* Copyright (C) 1991, 1993, 1996, 1997, 1998 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    see <http://www.gnu.org/licenses/>.  */
  17
  18 #include <stdio.h>
  19 #include "../misc/internals/tempname.h"
  20
  21 /* Generate a unique filename in P_tmpdir.  If S is NULL return NULL.
  22    This makes this function thread safe.  */
  23 char * tmpnam_r (char *s)
  24 {
  25     if (s == NULL)
  26         return NULL;
  27
  28     if (__path_search (s, L_tmpnam, NULL, NULL, 0))
  29         return NULL;
  30     if (__gen_tempname (s, __GT_NOCREATE, 0, 0, 0))
  31         return NULL;
  32
  33     return s;
  34 }